The Art and Magic of Hex Signs

The Circle - among the oldest symbols known to man, a symbol of eternity or infinity. Hex signs are traditionally round, utilizing this ancient symbol of continuity.

Distelfink (German: goldfinch, the good luck bird of the Pennsylvania Germans.) - good luck and happiness;
Two Distelfinks - good fortune doubled
Two Distelfinks Crossed - true friendship

Doves or Birds of Paradise - friendship, camaraderie, peace, purity and happiness. The beauty, wonder and mystery of life.

Crescent Moons - the four seasons, fertility, birth

Eagle - strength, courage, clarity of vision

Heart - true love, lasting love, charity, and love for others

Oak Leaf - long life, endurance, strength in body, mind and character.

Pineapple - welcome, hospitality, friendship

Raindrops - water, crop abundance and fertility

Rosettes - good luck

Scallops - ocean waves, smooth sailing in life

Stars - 5-Pointed Star - protection from fire and lightning or a protection for livestock, good fortune, hope, love, fertility, energy and harmony.
-The Eight-Pointed Star- The star is usually blue and symbolizes goodwill. Good omens, light and protection.
The Triple Star - good luck, success and happiness.

Sun Wheel - warmth and fertility

Trinity Tulips - proclaim faith, hope and charity

Wheat - abundance and goodwill

Sources: Igou, Brad. The Story of the Hex Sign (Available http://www.amishnews.com/featurearticles/Storyofhexsigns), Symbols.Com

Black - protection, unity, binds elements together

Blue - protection, peace, calmness, heaven and spirituality

Brown - mother earth, cycle of life or friendship and strength

Green - life, growth, fertility, success, ideas that grow

Orange - abundance in career, projects and matters needing an added push

Red - emotions, strength, passion, charisma, lust and creativity

Violet - sacred, dignity, royalty

White - purity, power of the moon, positive energy

Yellow - health in body and mind, the sun, connection to God